* PE acceptance workflows and Idempotency Test

Prior to this commit, maintenance and backups were done with cron
entries.  This commit replaces all but the backup feature with systemd
services and timers to provide better logging.

SUP-2404 systemd timers

PE Version and PDK Update

Prior to this commit, the disable_maintenance param was part of a
maintenance class that had been removed.  This commit fixes that and
moves the lookup to the param definition.

Prior to this commit, the ensure for the cron entries in the backup
class were hard coded to 'present' and could not be removed once set.
This commit adds a new parameter to manage the cron jobs based on if
$manage_database_backups is set.

Restructure if/else logic

Prior to this commit, the checks for managing the databases and having
systemd were done in the same check, so the warning was confusing.  This
commit moves $manage_database_maintenance to its own if clause.  It also
moves the $manage_database_backups inside the version check if, because
it makes more sense to put all of the resources behind the version
check.

Fix scope of disable_maintenance param

Fix path in backup.pp and reset pgrepack schema task

Add initial acceptance tests

Update readme for backup and maintenance changes

PE Version and PDK Update

This commit adds the streaming capabilities to the acceptance testing
bolt provisioning. This allows for better insight into the acceptance
testing output when diagnosing issues with the testing.

Addition of SLES 12 Test Platform

(maint) Add the bolt streaming to acceptance tests

Release prep v2.0.0